Twitter has an insurmountable number of applications from the very useful to the rather comical . It’s hard to weed through and find the truly great applications/services.

To better help you in your Twittering efforts, I’ve put together a list of 5 great tools to help you monitor your followers and unfollowers… since we all know is about that ratio. Hopefully you find the list useful. If there are some I’ve neglected to add or if you know of other ones please leave a comment with a description and a link.Are you using any of these apps to manage your unfollowers?

Twellow, The Twitter Yellow Pages, has many features that range from extended profiles to Twellowhood (one of my personal favorite Twitter tools on the Internet).

Mixed in with the plethora of features that Twellow offers is an unsung hero which is just simply called "Followers". With this you can easily see who is reciprocally following you. But, the best part of Followers is... you can follow or unfollow directly from Twellow. No clicking to go back to Twitter, you can get the job done without leaving the page.

UPDATE: Twellow has added a new feature that adds to the capabilities of "Followers" and "Friends", called "View Non-Mutuals". (Please note you must be logged in to use "View Non-Mutuals".)

View Non-Mutuals allows you to quickly see "Who your following, but not following you" and vice-versa "Whose falling you, but your not following". Just another simple, yet effective, update from Twellow.

Qwitter is a nice little service that emails you when someone stops following you on Twitter with a message, below is an example.

That's pretty much it... no extra frills.

Friend or Follow is pretty self-explanatory, you enter in your Twitter username and it gives you three tabs of information.

Following (who your following, but not following you back), fans (who’s following you, but your not following them back) and friends (people who you follow and they follow you back.

TweetLater is an online service that has an abundance of features ranging from scheduling tweets to Ping.fm integration. They offer a free account as well as a payed professional account.

Buried deep within the features of TweetLater is the option to "Follow those who follow you" and "Unfollow those who unfollow you". This is completely automated and set by the user.

Twitterless is an online service that notifies you when any Twitterer stops following you, and gives you their username. But, they don't stop there. They take it one step further and give you a graphed out "follower history" over a period of time to help you understand where your gaining or losing followers.

They also offer follower filters that give you a more descriptive view of your followers. You can filter in real time and search using keywords to see if your followers are talking about anything that interest you.